Tornado debris signature
Detection of tornado debris in weather radar / From Wikipedia, the free encyclopedia
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A tornadic debris signature (TDS), often colloquially referred to as a debris ball,[1] is an area of high reflectivity on weather radar caused by debris lofting into the air, usually associated with a tornado.[1][2] A TDS may also be indicated by dual-polarization radar products, designated as a polarimetric tornado debris signature (PTDS). Polarimetric radar can discern meteorological and nonmeteorological hydrometeors and the co-location of a PTDS with the enhanced reflectivity of a debris ball are used by meteorologists as confirmation that a tornado is occurring.[3]